Now those who should really not drink caffeine would people like trying to get pregnant and also women who are breast feeding really should not drink caffeine drinks of any kind,plus if you are trying to conceive you see caffeine has been linked to miscarriage and the decrease in fertility too,and if you are really prone to have anxiety because the caffeine can make you a lot worse, you see in studies caffeine has been found to make certain psychiatric conditions worse like irritability and hostility behavior and just plain anxious behavior also,plus caffeine can also worsen your preexisting conditions also like if you have acid reflux,and the gout and diabetes and IBS too,plus caffeine may interact with certain drugs like antidepressants and also asthma drugs.Now with all this being said about caffeine if can not go off cut down on how much you drink at least half the amount you will feel much better.